The proton magnetic resonance spectrum of partially oriented 1-phenylpropyne has been studied and the
values of the chemical shifts, the direct and the indirect coupling constants determined from the analysis of
the spectrum. The ratios of the interproton distances have been derived. No significant deviations have been
observed between the relative proton positions on the aromatic ring in 1-phenylpropyne and those expected
for the regular hexagonal geometry of the benzene ring. The results are insensitive to the mode of internal
rotation of the methyl group about the C-C bond.